Steel band form tie insert



Feb. 13, 1962 F. w. MARPE 3,020,616

STEEL BAND FORM TIE INSERT Filed Sept. 25, 1959 FIG. l.

INVENTOR.

Frederick W Marpe A'I'I'D RN EYE United States4 .Patent O 3,020,616 STEEL BAND FORM TIE INSERT Fredrick W. Marpe, 762 Griswold Road, Covina, Calif. Filed Sept. 25, 1959, Ser. No. 842,446 1 Claim. (1. 25-131) This invention relates to a steel band form the insert for use in concrete construction.

The object of the invention is to provide an insert for use with steel bands, wherein a means is provided for breaking the steel bands back inside the exterior surface of the concrete.

Another object of the invention is to provide a steel band form tie insert wherein the insert can be rotated after the concrete sets, so that the insert and formcan then be removed and whereby a hole which is left by the insert can be patched with concrete.

A further object of the invention is to provide a steel hand ffonn tie insert which is extremely simple and inexpensive to manufacture.

Other features and advantages will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this application, and in which like numerals are used to designate like parts throughout the same:

FIGURE 1 is a sectional view illustrating the present invention.

FIGURE 2 is an enlarged elevational view with parts broken away and in section, illustrating one of the inserts.

FIGURE 3 is an end elevational view of the insert.

FIGURE 4 is a view looking at the opposite end from that shown in FIGURE 3.

Referring in detail to the drawings, the numeral indicates a form which includes a sheeting 11, and studs 13 are arranged adjacent the outer surface of the sheeting 11, while the numeral 12 indicates concrete which is positioned between the spaced apart sheeting 11. The numeral 14 indicates a Wale, and the numeral 15 indicates a steel band which extends through the concrete 12 `and the steel band 15 has llooped end portions 16 through which extend the wales 14.

The sheeting 11 is provided with an opening 18, and the numeral 17 designates each of the steel band form tie inserts of the present invention. A pair of the inserts 17 are adapted to -be arranged in opposed relation with respect to each other, and each of the inserts 17 is (fabricated so that it has a unitary or one piece construction and is shaped to include a first tapered portion 19 which extends through an opening 1-8, and the portion 19' has a truste-conical formation. An enlarged second portion 20 of cylindrical formation is arranged contiguous to the larger end of the portion 19, and each insert 17 further includes an enlarged head or third portion 21 which is of rectangular formation, FIGURE 3.

Extending longitudinally through each insert is a slot or opening 22 for the passage therethrough of a portion of the band 15, and as shown in FIGURE 2, the outer end portion of the slot 22 is of ilaring formation as indicated by the numeral 23.

From the foregoing, it is. apparent that there has been provided a steel band form tie insert which is especially suitable for use in concrete construction work. According to the present invention, the inserts 17 are arranged so that their tapered portions 19 extend through the openings 18 in the sheeting 11 and extend into the concrete 12. After the concrete 12 hardens or sets, the inserts can be twisted so as to break the steel band and then the inserts are removed and the form is removed and the holes 24 left in the concrete 12 can be filled in or patched up with concrete. The inserts 17 include the tapered porrions 19 which facilitate the removal of the inserts, and the inserts also include the enlarged portions 20 which define shoulders, vand the diameter of the shoulder 20 is greater than the diameter of the opening 18 so as to limit inward movement of the inserts through the openings.

The flaring form-ation 23 facilitates the insertion of the band through the opening 22.

The parts can vbe made of any suitable material and in different shapes or sizes.

The form system or construction of the form may be varied as desired.

The purpose of the steel band form tie insert of the present invention is to break the steel band back inside the exterior surface of the concrete and this is done by rotating the inserts after theconcrete has set. The inserts and forms can then be removed and the holes left by the inserts are packed with concrete. The dimensions of the inserts can vary with the size of steel bands used and the depth of vbreak back required. The head of the insert can be of -any angle which the band as required by the tool used for rotating the insert and the shape can vary as long as the insert can Ibe rotated while the lband on the concrete side of the insert is held stationary by the concrete.

The insert is of one piece construction and is adapted to be used with a steel band in making concrete form ties. The purpose of the insert is to break the band after the concrete has set and it also serves to break the band back inside the face of the concrete surface and the band is broken by rotating the insert after the concrete has set.

Other types of form ties are composed of threaded or weakened rods. Steel bands have been used as form. ties 'but previous to the present invention no means has been provided for -breaking the bands 'back inside the face of the concrete as does the insert of the prwent invention. The reason for breaking the band back inside the concrete is that many specifications call for no metal showing after the concrete has been poured and the form removed. For example in the California Division of Highways, specications call for the form ties to be completely removed or any portion that is left in the concrete shall be at least one inch from the surface of the concrete.

It is believed that the present invention will increase the sale of steel banding and will cut construction costs.

Minor changes in shape, design and rearrangement of details coming within the field of invention claimed may be resorted to in actual practice, if desired.

I claim:

A device of the character described comprising a form embodying spaced apart sheeting 4adapted to have concrete therebetween, studs -adjacent to the outer surface of said sheeting, a steel -band projecting through the sheeting `and said Vband having looped end portions, wales projecting through said looped end portions, there being opposed openings in said sheeting, opposed inserts extending through said openings and said inserts having said band extending therethrough, each of said inserts embodying a `one piece construction and being shaped to include a tapered first portion having a frusto-conical shape, said tapered portion facilitating the removal of the inserts, a cylindrical section portion arranged contiguous to the large end of the rst portion and defining a shoulder, the diameter of said shoulder being greater than the diameter of the opening in the sheeting so as to limit inward movement of the inserts through the opening, a third portion of rectangular formation adjacent the second portion, there being a longitudinally extending slot in the insert for the projection therethrough of said band, the outer end portion of the slot being of daring formation.

(References on following page) References Cited in the le of this patent UNITED STATES PATENTS Boehm Jan. 16, 1917 Williams June 11, 1929 5 Willard June 9, 1931 Jones Sept. 6, 1932 

